Inheritance in java
Inheritance is the class acquire the another class.parents class acquire the child class.
Types of Inheritance
- Single Inheritance
- Multilevel Inheritance
- Multiple Inheritance
- Hierarchical Inheritance
- Hybrid Inheritance
1. Single Inheritance
Single Inheritance is the parents class acquire only one child class.
class A ↑ class B
Example
class A
{
A()
{
System.out.println("From Class A");
}
}
class B extends A
{
B()
{
System.out.println("From Class B");
}
}
public class Main
{
public static void main(String[] args)
{
B obj = new B();
}
}
Output
From Class A From Class B
2. Multilevel Inheritance
Some class having parents class and child class.That is Multilevel Inheritance.
class A ↑ class B ↑ class C
Example
class A
{
A()
{
System.out.println("From Class A");
}
}
class B extends A
{
B()
{
System.out.println("From Class B");
}
}
class C extends B
{
C()
{
System.out.println("From Class C");
}
}
public class Main
{
public static void main(String[] args)
{
C obj = new C();
}
}
Output
From Class A From Class B From Class C
3. Multiple Inheritance
Multiple Inheritance is one parents class having two or more child class.Unfortunate , java can't accept Multiple Inheritance.
class A class B ↖ ↗ class C
4. Hierarchical Inheritance
Some class having two or more child class that is call Hierarchical Inheritance.
class A ↗ ↖ class B class C
Example
class A
{
A()
{
System.out.println("From Class A");
}
}
class B extends A
{
B()
{
System.out.println("From Class B");
}
}
class C extends A
{
C()
{
System.out.println("From Class C");
}
}
public class Main
{
public static void main(String[] args)
{
C obj = new C();
}
}
Output
From Class A From Class C
5. Hybrid Inheritance
Hybrid Inheritance is combination of another types of inheritance.
Example
class A
{
A()
{
System.out.println("From Class A");
}
}
class B extends A
{
B()
{
System.out.println("From Class B");
}
}
class C extends B
{
C()
{
System.out.println("From Class C");
}
}
class D extends B
{
D()
{
System.out.println("From Class D");
}
}
public class Main
{
public static void main(String[] args)
{
D obj = new D();
}
}
Output
From Class A From Class B From Class D